Which could be a source of false indications on a test specimen?

Which could be a source of false indications on a test specimen?

• A. Penetrant on the test table, penetrant on the hands of the inspector, and contamination of dry or wet developer with penetrant
• B. Cleanliness of the test surface
• C. Adequate lighting
• D. Proper handling of penetrant

Answer: (A)

False indications in liquid penetrant testing come from contamination that transfers penetrant or developer onto the test surface or into the viewing materials, creating appearances that look like flaws when they aren’t real. If penetrant leaks onto the test table, gets on the inspector’s hands, or if the dry or wet developer becomes contaminated with penetrant, those stray penetrant residues can smear, bloom, or leave staining patterns. These artificial markings resemble genuine discontinuities and lead to false indications. Cleanliness of the test surface, adequate lighting, and proper handling of penetrant are all controls that help prevent or reduce false indications. A clean surface, good visibility, and careful handling minimize stray penetrant and prevent contamination, so they don’t introduce false indications themselves.

False indications in liquid penetrant testing come from contamination that transfers penetrant or developer onto the test surface or into the viewing materials, creating appearances that look like flaws when they aren’t real. If penetrant leaks onto the test table, gets on the inspector’s hands, or if the dry or wet developer becomes contaminated with penetrant, those stray penetrant residues can smear, bloom, or leave staining patterns. These artificial markings resemble genuine discontinuities and lead to false indications.

Cleanliness of the test surface, adequate lighting, and proper handling of penetrant are all controls that help prevent or reduce false indications. A clean surface, good visibility, and careful handling minimize stray penetrant and prevent contamination, so they don’t introduce false indications themselves.